Die casting machine



Jan. 8, 1952 F. HALWARD 2532.029

DIE CASTING MACHINE Filed March 11, 1948 5 Sheets-Sheet 5' INVENTOR. Fo/ke Ha/ a/"d BY 7 I romvsrs Patented Jan. 8, 1952 UNITED STATES PATENT OFFICE DIE CASTING MACHINE Folke Halward, Detroit, Mich.

Application March 11, 1948, Serial No. 14,311

3 Claims. (01. 22-68) This invention relates to die casting machines. It is the object of the invention to provide an improved power operated die casting machine in which the dies are closed and the molten metal pump is forced into the dies by separate power applications.

The dies when closed are stationary and do not move with the operation of the force pump. No check valves are employed. The cylinder of the pump when idle rests in a crucible of molten metal.

The cylinder of the injection pump is supported to swing on trunnions to permit the plunger and nozzle to be easily swung out of the crucible when the plunger and nozzle is uncoupled from the stationary mold support platen.

This is advantageous in repairing and replacement operations. I

The injection cylinder has outwardly and downwardly inclined ports just below the liquid level in the crucible. This insures the entry of clean molten metal into the injector cylinder as the outward ends of the passageways are below the surface of the molten liquid. This avoids the dross and foreign matter, which collects on the surface of the liquid. I

The lower die supporting platen is stationary at all times which facilitates loading and forcing inserts into the die. The only movable part of the machine to force the metal into the die is the injection cylinder and the cross bar supporting it.

Referring to the drawings:

Figure 1 is a vertical section of the improved machine, the valves controlling the fluid pistons being diagrammatically shown. v I

Figure '2 is an enlarged vertical section of the lower part of the machine ShOWiIlg' particularly the trunnion support of the cross member that carries the injection cylinder.

Figure 3 is a plan view of the cross member and the injection cylinder.

Figure 4 is a detailed elevation of the cross member and part of the injection cylinder.

l. designates the crucible, 2 the heating chamber, and 3 the main frame of the machine. This frame supports two stationary platens 4 and 5. The upper platen 4 supports the cylinder 6 in which moves a piston 1 connected by rod 8 with the upper die support 9. The upper die is designated Ill.

The lower platen supports the lower die II and also the plunger and nozzle member I2 which is clamped to the lower die II by means 01' the nut 13 that engages with the annular flange l4 of the nozzle and forces the spherical nozzle head l5 up against complementary spherical cavity I6 in the bottom of the lower die.

By this arrangement the nozzle and injectionplunger is clamped firmly to the die.

The injection cylinder I1 is suspended loosely by the'upper flange I8 and pins l9 inthe recess 20 of cross member '2l. This slightly floating suspension of the injection cylinder allows the cylinder to accommodate itself to the plunger and nozzle without binding, this freedom of the cylinder to accommodate itself to the stationary pistonisfurtheraided by the fact'that the cross member 20 is supported on trunnions 22 which are bolted by bolts 23 to the cross member. These trunnions turn in bearings 24 which are supported on the bottom of the rods 25 which are guided in vertical reciprocating movement in the slide bearings 26 and 21. The rods 25 with the cross head 28 make a movable frame which is raised and lowered by piston 29 guided in cylinder 30. The piston rod 3| passes through the cylinder head 32 and through a packing gland 33. Cylinder is bolted to the upper stationary platen 4. v

It will be noted that the passageways 34 in the injector cylinder are, directed outwardly and downwardly s0 theoutside ends of the passageways are. below the molten liquid level ,in the platen, hence the molten metal passing into the cylinder is free of dross and foreign matter that always collects on the surface of the molten metal.

To operate the machine the valve lever 35 is throwninto the outer position as shown iii-Figure 1. This allows oil or air under pressure to pass to the top of piston 1 by reason of the position of the slide valve 36 with respect to thefluid pipe 31 and the pipe connection 38 to top of cylinder 6. This closes the upper and lower dies l0 and II. Thereupon valve lever 39 can be shifted to the left from the position shown in Figure 1. This will connect the fluid supply pipe 40 withpipe 4| by'reason of sliding the valve 42 to the left thereupon piston 29 will be raised in cylinder 30' and this will cause the injection cylinder l1 to-rise out'of the crucible pot I and force a charge of molten metal through the plunger and nozzle l2 into the die cavities.

The stationary nozzle I 2 can be kept heated with a gas flame or other source of heat to make sure that the metal will not solidify in the nozzle. As the injection cylinder rises, the ports 34 are automatically closed without the use of objectionable check valves. On the down stroke when valve-lever 39 and valve 42 are shifted back to the right, fluid flows through the pipe 43 to the top of piston 29 and pushes the injection cylinder back into the pot, avacuum is caused in the tapered interior of the nozzle plunger member and this, with gravity, causes the molten metal to flow back into the pot. The liquid in the dies solidifies almost immediately because they are water cooled by water passing through the passages q p If it isdesired'to repair or replace'the injection pump or either member thereof this may be easily done by loosening the nut [3 to release the nozzle and then swinging the pumpoutof the crucible by turning it on the trunnions.

It will be obvious that other ways'of -moving the dies closed and moving theinjectorpnmp;

element may be provided. These actions may be made automatic by tripping the valve actuating members automatically instead of swinging the leversllqy :Somerother form of mechaniw cal operation forclosing-dies= and operating-the imector .pump mayzbensed. So I'wantdt 1m dens-toad that. I :am .not limited to .actnatinggmoe tors shown in;-the drawingvunlessr-these actuatingtmembersarespecificallyreciteddn the claims.

The @connection ior :iastening between :the die supportsxandstheadies isiindi-cated in-the drawings by crosses or 2 asterisks where the surfaces contact. This is merely .-'a graphic showing of the fastening rbetweeny thesemembers, .of 1 :course in apracticessome forum of clamp :or iotherrfasteningsdevice twill-have: to be usedusosas to. :the

- removal :of .the riies from-the die supports;

the crucible'an-d 'secure'd'to the lower die supportand "die by aremovab'le nut and shoulder onthe nozzle acIosed'end injector cylinder with side portsnear the top andjust under the lower end of the plunger whenlthe cylinderisin lowermost position and .ifitted over .the plunger and nozzle and. means fior reciprocating the injector cylinder from. a, position in the metal contained in said;crucible Withthefopemports below the molten metal below the lower, end of: the plunger and-the cylinder telescopedover the. nozzle to ;.a raised position above the lower end of the plunger and rnozzle toztherebyqclose :the said :ponts Jand thereby inject agchargeaof liquid :metal through thejplungernndnozzle :into the cavities of the closed dies, theirmeansftortreciprocating thevinjectorcylinder including "a "cross member supported to tilt on trunnions "so that:the injector cylinder-can 'be swungin and out of the crucible when the nutis unscrewed-and the nozzle removed. i

2; Ina die-casting machine-thecombination of idi'e's; means for supporting and moving the diesirom iapen to closed posi'tion and from closed :to open position, a crucible, ail-injector pump comprising a plungenand nozzle removably: cou- 4 pled to the lower die support and die and a closed end injector cylinder with side ports and fitted over the plunger and nozzle and means for reciprocating the injector cylinder from a position in the metal contained in said crucible with the open ports below the molten metal below the lower end of the plunger and the cylinder telescoped over the nozzle to a raised position above the lower end of the plunger and nozzle to thereby close the said ports andl'th'ereby inject a charge of liquidmetal through the plunger and nozzle into the cavities of the closed dies, the

the injector cylinder is loosely rested at its top and held -in place by a flange thereby to give freedom to the injector cylinder to accommodate itself to the fixed plunger and nozzle memher; over which it glides, said cross member supported at its ends to rock on trunnions whereby the-inj ector cylinder-andplungerv may-be turned up out of .the crucible .when the nozzle-connection with the die. is uncoupled.

3. Ina die castingmachine a frame having a stationary platen, a lower die supported on said stationary platen, a die support vertically movablewith: respect to the frame, an upper diesupported thereby, a fixed plunger and nozzle coupled with said stationaryplaten .and lower die, a ported closed end: injector cylinder attall times telescoping over the nozzle and normally tresting in 1 molten metal with the, ports below the liquid level, a crucible for containing the said molten-metal, means f.or. .closing the. dies together by movingthe upper die, a supporting member loosely suspending the injecting --cylinder in .a floating relation permittingit' to accommodate itself to the stationary plunger-nozzlethesaid supporting member being in turn supported-t0 rock and thereby permitthe injector cylinder and the plunger nozzle-member to be rocked out of the crucible when the. nozzle is uncoupled from the stationary platen,'and means'for raising the ported closed endcylinderoutof the crucible,

the cylinder moving up theexterior of theplum ger-nozzle member thereby .closingsaid portsand forcing -.a charge of molten liquid into the cavities of the die.

FOLKE .HALWARD.

REFERENCES .CITED The following references are of record the file of this patent:

UNITED STATES PATENTS Great Britain 1912 

